JP6964642B2 - Car side sill structure - Google Patents

Description

The present invention relates to a side sill structure of an automobile that suppresses the collapse of a closed cross section of the side sill when an object such as a vehicle collides with a side sill extending to the lower sides of both sides of the vehicle.

Conventionally, as a structure of a side sill extending in the front-rear direction across the roots of center pillars erected on the left and right sides of the vehicle near the center in the front-rear direction of the vehicle, there is a structure in which a bulkhead is arranged inside the side sill. As a side sill structure of this kind, for example, there is a structure described in Patent Document 1. In this structure, a side sill stiffener (also called a stiffener) having a U-shaped cross section on the outer side in the vehicle width direction and a side sill inner (also called an inner) having a U-shaped cross section on the inner side are butted and joined to a closed cross section. .. A bulkhead is arranged in the side sill, and the bulkhead suppresses the collapse of the closed cross-sectional structure of the side sill.

Japanese Patent No. 6179382

By the way, in Patent Document 1, the upper flanges of both the stiffener and the inner are joined by spot welding under the same height as the upper wall of the stiffener and the upper wall of the inner forming the side sill. However, depending on the side sill, there is a structure in which the upper wall of the stiffener is higher than the upper wall of the inner and both upper flanges are joined. In the case of this structure, the upper flange of the stiffener is joined by spot welding at a position higher than the upper flange of the inner.

In the case of this side sill structure, when there is a side collision with the side sill, the upper flange of the high stiffener on the outside of the vehicle falls to the upper flange side of the lower inner of the vehicle, and both upper flanges tilt. At the time of this tilting, a shear load is applied in which the high upper flange moves upward with respect to the lower upper flange. Since spot welding is easily peeled off by a shearing force, the spot welding of both upper flanges will be peeled off when a shear load is applied. When the spot weld is peeled off, there is a problem that the closed cross-sectional structure of the side sill due to the butt of the stiffener and the inner collapses, and the center pillar tilts toward the indoor side and deforms.

The present invention has been made in view of such circumstances, and is capable of suppressing the collapse of the closed cross-sectional structure of the side sill due to the abutment of the side sill stiffener and the side sill inner, and preventing the center pillar from being deformed to the indoor side. It is intended to provide a side sill structure.

In order to achieve the above object, the side sill structure of the automobile of the present invention includes a side sill in which the side sill stiffener and the side sill inner are joined by upper and lower flanges to form a closed cross section extending in the front-rear direction, and a lower end is provided on the side wall of the side sill stiffener. The side sill comprises a combined center pillar and a bulkhead installed inside the side sill stiffener to partition the closed cross section back and forth, the side sill having a higher upper wall of the side sill stiffener than the upper wall of the side sill innerr. At the position, the upper flange of the side sill stiffener and the upper flange of the side sill inner have a welded portion, and the bulkhead is arranged at a position higher than the upper wall of the side sill inner and is in a side collision state. while organic interfering bulkhead interference portion has a cross-section holding portion for holding the side sill stiffener cross-sectional shape in the vehicle width direction inner edge of the section holding portion, from a higher position than the upper wall of the side sill inner It is characterized by forming a shape extending downward.

According to the present invention, it is possible to suppress the collapse of the closed cross-sectional structure of the side sill due to the butting of the side sill stiffener and the side sill inner, and prevent the center pillar from being deformed to the indoor side.

It is a side view which shows the whole structure including the side sill structure of the automobile of this embodiment. It is a perspective view which shows the internal structure of a side sill. It is a perspective view which shows four bulkheads attached to a reinforcing plate. It is a figure which shows the closed cross section shape of the side sill which is the IV-IV cross section of FIG. 2, and the side surface shape of the bulkhead on the rear side of a vehicle from the cross section. It is a perspective view of the bulkhead connected by the connecting piece. It is sectional drawing which emphasizes the upper triangular part and the lower triangular part of a bulkhead and a side bulk stiffener. It is sectional drawing which emphasizes the cross-sectional holding part and the load transmission part of a bulkhead. It is a perspective view which shows the step part of a bulkhead. It is a top view which shows the structure of the vicinity of the reinforcing plate on the bottom surface side of a vehicle. FIG. 2 is a cross-sectional view taken along the line XX of FIG.

<Structure of Embodiment>
Embodiments of the present invention will be described in detail with reference to FIGS. 1 to 10. In the description, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a side view showing an overall configuration including a side sill structure of an automobile (vehicle) of the present embodiment.
The vehicle 10 shown in FIG. 1 includes a side sill 11 having this characteristic structure and a center pillar 12. The side sill 11 and the center pillar 12 are arranged symmetrically on the left and right sides of the vehicle 10, and in this example, the right side of the vehicle is represented and the description thereof will be given. The center pillar 12 is erected at the center of the vehicle 10, and a side sill 11 extending in a cylindrical shape having a predetermined length in the front-rear direction of the vehicle is joined to the lower end side of the center pillar 12. A front seat side door opening 13 is provided on the vehicle front side of the center pillar 12, and a rear seat side door opening 14 is provided on the rear side.

As shown in FIG. 2, a reinforcing plate 21 extending across the center pillar 12 is arranged inside the side sill stiffener 15 which is a constituent member of the side sill 11. As shown in FIG. 3, four bulkheads 31a, 31b, 31c, and 31d are arranged and provided inside the reinforcing plate 21 in the vehicle width direction from the front side to the rear side of the vehicle.

The side surface shapes of the bulkheads 31a to 31d are shown in FIG. 4 on behalf of the bulkheads 31c. FIG. 4 shows the closed cross-sectional shape of the side sill 11 which is the IV-IV cross section of FIG. 2, and the side surface shape of the bulkhead 31c when the rear side of the vehicle is viewed from the cross section. Hereinafter, the bulkhead 31c will be mainly described as a representative.

As shown in FIG. 4, the side sill 11 has a U-shaped cross-sectional shape side sill stiffener (stiffener) 15 arranged on the outside (right side) of the vehicle in the vehicle width direction and a U-shaped cross-sectional shape arranged inside the stiffener 15. The side sill inners (inners) 16 are abutted and joined to form a square closed cross section.

The stiffener 15 includes an upper flange 15a bent upward from this U-shaped cross-sectional shape and a lower flange 15b bent downward, and the inner 16 also includes an upper flange 16a and a lower flange 16b. The upper wall 15c of the stiffener 15 (stiffener upper wall 15c) exists at a position higher than the upper wall 16c of the inner 16 (inner upper wall 16c), and the upper flange 15a of the stiffener 15 is also higher than the upper flange 16a of the inner 16. Exists in position. In this state, both upper flanges 15a and 16a are brought into contact with each other with the center pillar inner 12a sandwiched between them, and are spot-welded as shown by x mark 22. This welded portion is called a spot welded portion (welded portion) 22. At least, the inner end of the stiffener upper wall 15c may be higher than the outer end of the inner upper wall 16c.

Further, both lower flanges 15b and 16b are spot-welded (not shown) with the lower wall 15e of the stiffener 15 at a position higher than the lower wall 16e of the inner 16 and sandwiching the lower end portion of the center pillar panel 12b (not shown). Has been done. Both lower flanges 15b and 16b have a portion that sandwiches the lower end portion of the center pillar panel 12b and a portion that does not sandwich the lower end portion, and the cross section of FIG. 4 shows a portion that does not sandwich the lower end portion.

A reinforcing plate 17a having an L-shaped cross section extending in the vehicle front-rear direction is fixed to the inner upper corner portion of the inner 16 having a U-shaped cross section, and a reinforcing plate 17b extending in the vehicle front-rear direction having an L-shaped cross section is also fixed to the lower corner portion. It is fixed. The bent corners of the inner 16 are reinforced by these reinforcing plates 17a and 17b.

Inside the stiffener 15 having a U-shaped cross section, reinforcing plates 21 having a U-shaped cross section are arranged so that the U-shaped shapes are aligned in the same direction. A bulkhead 31c is arranged inside the stiffener 15 via the reinforcing plate 21. The bulkhead 31c has a bulkhead interference portion 1g that interferes with the upper flange 16a of the inner 16 in a side collision state when the bulkhead 31c collides with the side sill 11 as surrounded by a broken line frame 41. In addition, when it is described simply as a side collision or a side collision state, it means a case where an object collides with the side sill 11.

The bulkhead interfering portion (also referred to as an interfering portion) 1g is formed with a predetermined length in the vehicle width direction, and has a connecting portion 29a indicated by a cross to be coupled to the stiffener upper wall 15c in the middle of the length portion. .. As shown in FIG. 5, in the connecting portion 29a, a bent piece 1h in which the upper side portion of the interfering portion 1g is bent in any of the front-rear directions of the vehicle is overlapped and connected (joining portion 29a) to the stiffener upper wall 15c (FIG. 4). Is formed. In the example shown in FIG. 5, the interference portion 1g of the bulkhead 31c includes a bent piece 1h bent toward the front side of the vehicle, and the interference portion 1g of the bulkhead 31d includes a bent piece 1h bent toward the rear side of the vehicle. ..

However, the bulkheads 31a to 31d may be arranged inside the stiffener 15 without the reinforcing plate 21.

Returning to FIG. 4, the side surface shape of the bulkhead 31c extends diagonally, at least on the upper side, with an upper wall 1i extending in the vehicle width direction, an upwardly inclined portion 1j extending diagonally, and a side wall 1k extending vertically on the outside of the vehicle. It has a lower inclined portion 1l and a lower wall 1m extending in the vehicle width direction on the lower side. Further, the joint portions 29b, 29c, 29d by spot welding with the stiffener 15 at three locations, the upper inclined portion 1j side of the upper wall 1i, the side wall 1k, and the lower inclined portion 1l side of the lower wall 1 m. Has.

More specifically, the upper wall 15c and the side wall 15d of the stiffener 15 are connected to each other in a dogleg shape in cross section, and the upper inclined portion 1j of the bulkhead 31c located inside the first doglegged wall 15g. The upper triangular portion 15 g is formed with a triangular cross section {see the broken line triangular frame 42 in FIG. 6}. Further, a second bent-shaped wall 15h in which the side wall 15d and the lower wall 15e of the stiffener 15 are connected in a dogleg shape in cross section, and a lower inclined portion 1l of the bulkhead 31c located inside the second doglegged wall 15h. A lower triangular portion 15h having a triangular cross section {see the broken line triangular frame 43 in FIG. 6} is formed.

The joint portions 29b, 29c, 29d of the bulkhead 31c and the stiffener 15 described above are the side portion of the bulkhead 31c on the upper inclined portion 1j side of the upper wall 1i, the side portion of the side wall 1k, and the lower inclined portion of the lower wall 1 m. Folded pieces 1j1,1k1,1m1 in which three side portions with the side portion on the 1l side are bent 90 degrees toward the vehicle front side of the bulkhead 31c shown in FIG. 5 are formed on the upper wall of the stiffener 15 shown in FIG. It is formed by overlapping and connecting to 15c, a side wall 15d, and a lower wall 15e.

As shown in FIG. 7 having the same cross section as that of FIG. 4, the bulkhead 31c has a cross-section holding portion 1o (a portion surrounded by a frame 47) that holds the cross-sectional shape of the stiffener 15. Further, the bulkhead 31c is a load transmitting portion 1p (frame) that is approximately the lower half of the cross-section holding portion 1o and is extended from the inner end of the vehicle in the vehicle width direction toward the rear support cross member 18 of the front seat, which will be described later. The part enclosed by 48). The load transmitting portion 1p is arranged in the cross section of the inner 16.

Further, the cross-section holding portion 1o is in a state where the upper wall 1i, the side wall 1k and the lower wall 1m of the cross-section holding portion 1o are in contact with the inner surfaces of the upper wall 15c, the side wall 15d and the lower wall 15e (see FIG. 4) of the stiffener 15. It is fitted. By this fitting, the bulkhead 31c supports the closed cross section from the inside of the stiffener 15 so as not to collapse. Since the load transmitting portion 1p enters the U-shaped cross-sectional shape of the inner 16 and is arranged in a state close to the rear supporting cross member 18, it can interfere with the rear supporting cross member 18 with a slight movement at the time of a side collision. It has become.

Returning to FIG. 5, the bulkheads 31c and 31d are arranged in pairs in the vehicle front-rear direction, and the paired bulkheads 31c and 31d are connected by a connecting piece 31g. That is, as shown in FIG. 3, the two bulkheads 31a and 31b on the front side are connected by the connecting piece 31h, and the two bulkheads 31c and 31d on the rear side are connected by the connecting piece 31g.

As shown by the bidirectional arrow Y3 in FIG. 7, the representative bulkhead 31c is located between one end of the cross-section holding portion 1o, which is a vertical wall, on the stiffener side wall 15d side and the other end on the load transmitting portion 1p side. As shown in 8, a step portion 1q having a step in the front-rear direction of the vehicle is formed. For example, as shown in FIG. 5, the bulkhead 31c is formed with a step portion 1q due to a step in which the cross-section holding portion 1o (FIG. 7) is bent toward the rear side of the vehicle and protrudes. The bulkhead 31d is formed with a step portion 1q formed by a step in which the cross-section holding portion 1o is bent toward the front side of the vehicle and protrudes.

As shown in the plan view on the bottom surface side of the vehicle in FIG. 9, the reinforcing plate 21 is arranged. As shown in FIG. 4, the reinforcing plate 21 is arranged between the inside of the stiffener 15 and the bulkhead 31c, and a predetermined portion is joined to the upper wall 15c and the side wall 15d of the stiffener 15 together with the bulkhead 31c (joining portion 29b). , 29c).

Further, as shown in FIG. 9, a front support cross member 19 extending in the vehicle width direction to support the front portion of the front seat and extending in the vehicle width direction adjacent to the center pillar 12 (FIG. 2). A rear support cross member 18 that supports the rear portion of the front seat is provided. The reinforcing plate 21 extends at least between the front support cross member 19 and the rear support cross member 18, and the side collision interference portion 21b extends inward in the vehicle width direction at the lower end of the center pillar 12. The configuration is as follows. For example, the reinforcing plate 21 is extended with a length of equal to or greater than the distance L1 between the cross members 18 and 19 on both sides. Further, the rear end of the reinforcing plate 21 protrudes to the rear side of the rear support cross member 18, and the front end protrudes to the front side of the front support cross member 19.

Further, the reinforcing plate 21 includes a side collision interference portion 21b extending inside the vehicle in the vehicle width direction. The side collision interference portion 21b is adjacent to the root portion (see FIG. 2) of the center pillar 12, and extends inward in the vehicle width direction by an arrow Y1 from the base end portion 21h having a width W1 in the vehicle width direction. It is formed by the width W2.

As shown in FIG. 10 showing the XX cross section of FIG. 2, the side collision interference portion 21b is gradually separated from the joint portion 23 of the reinforcing plate 21 to the stiffener upper wall 15c with respect to the upper wall 15c. It extends to the inside of the vehicle in the width direction of the vehicle while bending, and extends to a position close to the inner upper wall 16c. That is, the side collision interference portion 21b has the same height as the inner upper wall 16c. The side collision interference portion 21b interferes with the inner upper wall 16c via the center pillar panel 12b by only slightly moving to the inner 16 side at the time of side collision with the side sill 11.

The center pillar outer 12c of the center pillar 12 shown in FIG. 2 has a front seat side door opening edge (also referred to as a door opening edge) 12e on the front seat side door opening 13 side. A second spot welded portion (second welded portion) 26 indicated by a cross is provided on the lower end side of the door opening edge 12e of the center pillar outer 12c. The second spot welded portion 26 is shown in FIG.

In FIG. 10, first, between the upper flanges 15a and 16a of both the stiffener 15 and the inner 16, there is an overlapping portion spot-welded (spot welded portion 22) with the center pillar inner 12a interposed therebetween. Further, there is an overlapping portion where the center pillar inner 12a is sandwiched between the upper flange 16a of the inner 16 and the center pillar outer 12c and spot welded (second spot welded portion 26). That is, the upper flange 16a of the inner 16 is welded to the stiffener 15 at the spot weld 22 and welded to the center pillar outer 12c at the second spot weld 26, and is welded to the lower end of the upper flange 16a of the inner 16. , The side collision interference portion 21b is in close proximity.

The bulkheads 31a to 31d coupled to the three surfaces (see FIG. 4) of the upper and lower surfaces of the U-shaped cross section of the reinforcing plate 21 shown in FIG. 9 and the side surfaces between the upper and lower surfaces interfere with the side collision of the reinforcing plate 21. The portion 21b is arranged in a portion other than the formed portion. That is, the bulkheads 31a and 31b on the front side of the vehicle are arranged adjacent to the front support cross member 19 in the vehicle width direction, and the bulkheads 31c and 31d on the rear side are adjacent to the rear support cross member 18. They are arranged together. In other words, the reinforcing plate 21 is aligned with the front support cross member 19 via the front bulkheads 31a and 31b in the vehicle width direction, and the rear support cross member via the rear bulkheads 31c and 31d. It is arranged so as to be aligned with 18.

<Effect of embodiment>
As described above, the features of the side sill structure of the automobile of the present embodiment will be described.

(1) A side sill 11 that connects the stiffener 15 and the inner 16 with upper and lower flanges 15a, 16a, 15b, 16b to form a closed cross section extending back and forth, and a center pillar 12 having a lower end joined to the side wall of the stiffener 15. The side sill 11 is provided with bulkheads 31a to 31d which are installed inside the stiffener 15 and partition the closed cross section in the front-rear direction. The bulkheads 31a to 31d have a spot welded portion (welded portion) 22 in which the upper flange 15a and the upper flange 16a of the inner 16 are welded, and the bulkheads 31a to 31d interfere with the upper wall 16c of the inner 16 in a lateral collision state. It has a configuration having 1 g of an interfering portion (interfering portion). In the following, the bulkhead 31c among the bulkheads 31a to 31d will be described mainly as a representative.

According to this configuration, since the interference portion 1g is located in the vicinity of the upper wall 16c of the inner 16 in the vehicle width direction, when the interference portion 1g of the bulkhead 31c slightly moves at the time of side collision with the side sill 11. Interferes with the upper wall 16c of the inner 16. In a state where the interference portion 1g interferes with the upper wall 16c of the inner 16, the upper flange 15a of the stiffener 15 does not fall and is maintained in an upright state. Therefore, it is possible to prevent the upper flanges 15a and 16a of both the stiffener 15 and the inner 16 from falling. By this fall prevention, the spot welds 22 of both upper flanges 15a and 16a are not peeled off without applying a shear load, so that the spot welds 22 can be prevented from breaking.

Therefore, it is possible to suppress the collapse of the closed cross-sectional structure extending in the front-rear direction of the side sill 11 due to the abutment of the stiffener 15 and the inner 16 and prevent the center pillar 12 from being deformed to the indoor side. As a result, the side collision protection performance can also be increased.

Even if the spot weld 22 connecting both upper flanges 15a and 16a breaks at a hitting point or the like, the interference portion 1g of the bulkheads 31a to 31d coupled to the stiffener 15 interferes with the upper flange 16a of the inner 16. Since it is in a state, the cross section of the stiffener 15 does not collapse. Therefore, the side sill 11 can be prevented from opening in a closed cross section, and the center pillar 12 can be prevented from being deformed to the indoor side.

The inner upper wall 15c is located higher than the inner upper wall 16c, and the inner upper wall 16c is arranged at a lower position in the vehicle interior by connecting both upper flanges 15a and 16a at the spot welded portion 22. Therefore, the indoor space can be expanded.

(2) The interference portion 1g has a configuration having a coupling portion 29a with the upper wall 15c of the stiffener 15.

According to this configuration, the interference portion 1g is strengthened because it is coupled to the stiffener upper wall 15c by the coupling portion 29a. Therefore, it is possible to prevent the interference state of the interference portion 1g from the inner flange 16a from coming off during the side collision. That is, the interference state of the interference portion 1g with the upper flange 15a of the inner 16 can be maintained so that the upper flanges 15a and 16a of both the stiffener 15 and the inner 16 do not fall and both of them do not come off.

(3) In the joint portion 29a between the interference portion 1g and the stiffener upper wall 15c, a bent piece 1h obtained by bending the upper side portion of the interference portion 1g in any of the front-rear directions of the vehicle is overlapped and coupled to the upper wall 15c of the stiffener 15. It was configured to be formed.

According to this configuration, since the interference portion 1g is overlapped and coupled to the stiffener upper wall 15c by the bent piece 1h having a large area, this coupling (joining portion 29a) is strengthened and the rigidity is increased. Therefore, the interference effect of the interference portion 1g with the inner upper wall 16c can be increased.

(4) The bulkhead 31c has at least an upper wall 1i, an upper inclined portion 1j, a side wall 1k, a lower inclined portion 1l, and a lower wall 1m. The side wall 1k and the lower inclined portion 1l side of the lower wall 1m have connecting portions 29a, 29b, and 29c with the stiffener 15. Further, the first doglegged wall 15g in which the upper wall 15c and the side wall 15d of the stiffener 15 are connected in a dogleg shape in cross section, and the upward inclined portion 1j located inside the first doglegged wall 15g have a triangular cross section { Refer to the broken line triangular frame 42 shown in FIG. 6} to form the upper triangular portion 15 g. Further, the side wall 15d and the lower wall 15e of the stiffener 15 are connected to each other in a dogleg shape in cross section, and the second dogleg wall 15h and the downward inclined portion 1l located inside the second dogleg wall 15h have a triangular cross section { Refer to the broken line triangular frame 43 shown in FIG. 6}, and the lower triangular portion 15h is formed.

According to this configuration, since the upper triangular portion 15g and the lower triangular portion 15h have a triangular shape, the rigidity is high. This triangular shape is formed as an upper triangular portion 15g and a lower triangular portion 15h at the upper and lower corner portions in the closed cross section between the side wall 15d of the stiffener 15 and the bulkheads 31a to 31d. Therefore, since the rigidity of the stiffener side wall 15d side including the bulkhead 31c is increased, the collapse of the cross-sectional shape of the stiffener 15 can be suppressed, and the collapse of the closed cross section of the side sill 11 can be suppressed.

(5) The joint portions 29b, 29c, 29d of the bulkhead 31c and the stiffener 15 described above are the side portion of the bulkhead 31c on the upper inclined portion 1j side of the upper wall 1i, the side portion of the side wall 1k, and the lower wall 1m. The side portion on the lower inclined portion 1l side is formed by superimposing and connecting the bent pieces 1j1, 1k1, 1m1 bent in any of the front-rear directions of the vehicle to the upper wall 15c, the side wall 15d, and the lower wall 15e of the stiffener 15. It was configured.

According to this configuration, since the area of the coupling portions 29b, 29c, 29d of the bulkhead 31c to the stiffener 15 is increased, the coupling portions 29b, 29c, 29d are strengthened and the rigidity is increased. Therefore, the collapse of the cross-sectional shape of the stiffener 15 can be suppressed, and the collapse of the closed cross-section of the side sill 11 can be suppressed.

(6) A rear support cross member 18 that is erected between the left and right side sills 11 and supports the rear portion of the front seat is further provided. The bulkhead 31c has a cross-sectional holding portion 1o that holds the cross-sectional shape of the stiffener 15 and a load transmitting portion 1p that extends inward in the vehicle width direction from the cross-sectional holding portion 1o. The configuration is such that it is arranged at a position corresponding to the rear support cross member 18.

According to this configuration, the cross-section holding portion 1o of the bulkhead 31c is arranged along the inside of the stiffener 15 at the time of lateral collision with the side sill 11, so that the cross-section holding portion 1o supports the inside of the stiffener 15 from the inside. Therefore, the cross-sectional collapse of the stiffener 15 can be suppressed. Further, at the time of lateral collision, the load transmitting portion 1p interferes with the rear support cross member 18 via the side wall 16d of the inner 16, so that the lateral impact load can be transmitted to the rear support cross member. As a result, the collapse of the closed cross section of the side sill 11 can be suppressed.

(7) The bulkheads (for example, bulkheads 31c and 31d) are arranged in pairs in the vehicle front-rear direction, and the pair of bulkheads 31c and 31d are connected by a connecting piece 31g, and the side wall of the stiffener 15 in the cross-section holding portion 1o. The structure is such that a step portion 1q having a step in the front-rear direction of the vehicle is provided between one end on the side and the other end of the load transmission portion 1p.

According to this configuration, the pair of bulkheads 31c and 31d are connected by a connecting piece 31g, and a step that bends in the front-rear direction of the vehicle is formed in the vehicle width direction on the cross-section holding portion 1o that is the wall surface of the pair of bulkheads 31c and 31d. An extended step portion 1q is formed. Therefore, the cross-section holding portion 1o, which is the wall surface of the bulkheads 31c and 31d, has a ridge line formed by the step portion 1q in the vehicle width direction, so that the strength is increased against the lateral impact load. That is, the strength of the pair of bulkheads 31c and 31d connected by the connecting piece 31g is increased, and the strength of the wall surface of each of the bulkheads 31c and 31d is increased. Therefore, the lateral thrust load can be reliably transmitted to the rear support cross member 18 via the bulkheads 31c and 31d without breaking the bulkheads 31c and 31d, so that the side sill 11 can suppress the collapse of the closed cross section.

(8) A front support cross member 19 that extends in the vehicle width direction to support the front portion of the front seat, is arranged between the inside of the stiffener 15 and the bulkheads 31c to 31d, and is arranged between the bulkheads 31c to 31d and the upper wall 15c of the stiffener 15. The side wall 15d is provided with a reinforcing plate 21 coupled together with the bulkheads 31a to 31d. The reinforcing plate 21 extends at least between the front support cross member 19 and the rear support cross member 18, and extends inward in the vehicle width direction from the middle portion of the extension, and the inner 16 It is configured to have a side collision interference portion 21b that interferes with the upper wall 16c in a side collision state.

According to this configuration, the side collision interference portion 21b can be formed only by extending the reinforcing plate 21 inward in the vehicle width direction, so that the side collision interference portion 21b can be easily formed. Further, since the side collision interference portion 21b has a shape that only extends the reinforcing plate 21 inward in the vehicle width direction, it can be formed with a small amount of material, and therefore the reinforcing plate 21 can be reduced in weight. Further, since the reinforcing plate 21 extends the side portion of the vehicle body long in the front-rear direction of the vehicle to reinforce it, the occupant of the front seat can be protected from the side collision.

(9) The center pillar outer 12c forming the front seat side door opening edge 12e includes a second spot welded portion (second welded portion) 26 to be welded to the upper flange 15a of the inner 16. The side collision interference portion 21b is configured to be close to the lower end of the upper flange 16a of the inner 16 having the second spot welded portion 26.

According to this configuration, the following effects can be obtained. The root of the center pillar 12 of the front seat side door opening edge 12e (corner portion of the front seat side door opening 13) is a portion where the maximum stress acts at the time of side collision. Therefore, in addition to the coupling of the upper flanges 15a and 16a of both the stiffener 15 and the inner 16 (spot welded portion 22), a second spot welded portion 26 in which the center pillar outer 12c is welded to the upper flange 16a of the inner 16 is provided. For example, the welding strength of the inner 16 is increased. Therefore, it is possible to suppress the breakage of the spot weld at the time of the side collision, so that the side collision performance can be efficiently improved.

(10) The reinforcing plate 21 has a U-shaped cross-sectional shape when viewed from the front-rear direction of the vehicle, and the front seat is formed in the vehicle width direction via bulkheads 31a and 31b fixed inside the U-shaped cross-sectional shape. It was configured to be aligned with the cross member for front support.

According to this configuration, the reinforcing plate 21, the bulkheads 31a and 31b, and the front support cross member 19 are aligned in the vehicle width direction orthogonal to the vehicle front-rear direction. Therefore, as shown in FIG. 2, even if the spot welded portion 22 (FIG. 4) breaks from the root of the center pillar 12 and the break extends forward of the vehicle as shown by the arrow Y2, it is orthogonal to the extending direction. The three members aligned in the state work together to absorb the energy of elongation fracture. This can prevent the elongation of the fracture.

Although the side sill structure of the automobile according to the present embodiment has been described above, the present invention is not limited to this, and can be appropriately changed without departing from the gist of the present invention.

10 Vehicles (automobiles)
11 Side sill 12 Center pillar 12a Center pillar inner 12b Center pillar panel 13 Front seat side door opening 14 Rear seat side door opening 15 Side sill stiffener 15a Side sill stiffener upper flange 15b Side sill stiffener lower flange 15c Side sill stiffener upper wall 15e Lower wall 16 Side sill inner 16a Upper flange of side sill inner 16b Lower flange of side sill inner 16c Upper wall of side sill inner 16e Lower wall of side sill inner 17a, 17b Reinforcing plate 18 Cross member for rear support of front seat 19 Front support of front seat Cross member 21 Reinforcement plate 21b Side collision interference part of reinforcement plate 21d Upper wall of reinforcement plate 21e Side wall of reinforcement plate 21f Lower wall of reinforcement plate 21h Base end part of reinforcement plate 22 Spot welds 23, 29a, 29b, 29c Coupling Part 26 Second spot weld 31a to 31d Bulkhead 1i Bulkhead upper wall 1j Bulkhead upper tilt 1k Bulkhead side wall 1l Bulkhead lower tilt 1m Bulkhead lower wall 31g, 31h Connecting piece 33 Floor panel 33a raised part

Claims (9)

Side sill The side sill that connects the stiffener and the side sill inner with the upper and lower flanges to form a closed cross section that extends back and forth,
A center pillar with the lower end connected to the side wall of the side silstifuna,
It is installed inside the side bulkhead and has a bulkhead that partitions the closed cross section back and forth.
The side sill has a welded portion in which the upper flange of the side sill stiffener and the upper flange of the side sill inner are welded at a position where the upper wall of the side sill stiffener is higher than the upper wall of the side sill innerr .
The bulkhead is configured to have a interfering bulkhead interference portion in a side collision state is located higher than the upper wall of the side sill inner has a cross-section holding portion for holding the side sill stiffener cross-
The side sill structure of an automobile is characterized in that the inner edge of the cross-section holding portion in the vehicle width direction extends downward from a position higher than the upper wall of the side sill innerr. Side sill The side sill that connects the stiffener and the side sill inner with the upper and lower flanges to form a closed cross section that extends back and forth,
A center pillar with the lower end connected to the side wall of the side silstifuna,
A bulkhead installed inside the side bulkhead and partitioning the closed cross section back and forth,
A cross member for front support that extends in the vehicle width direction and supports the front part of the front seat,
A cross member for rear support that extends in the vehicle width direction and supports the rear part of the front seat,
The sill wherein the inner stiffener disposed between the bulkhead, e Bei a reinforcing plate coupled with the bulkhead to the upper wall and side walls of the side sill stiffener,
The side sill has a welded portion in which the upper flange of the side sill stiffener and the upper flange of the side sill inner are welded at a position where the upper wall of the side sill stiffener is higher than the upper wall of the side sill innerr.
The bulkhead has a bulkhead interference portion that interferes with the upper wall of the side silin inner in a lateral collision state.
The bulkhead interference portion has a joint portion with the upper wall of the side silstifuna, and has a joint portion.
The reinforcing plate extends at least between the front support cross member and the rear support cross member, and extends inward in the vehicle width direction from an intermediate portion of the extension, and the side sill innerr. An automobile side sill structure characterized by having a side collision interfering portion that interferes with the upper wall in a side collision state. The center pillar outer forming the front seat side door opening edge is provided with a second weld to be welded to the upper flange of the side sill inner.
The side sill structure of an automobile according to claim 2 , wherein the side collision interference portion is close to the lower end of the upper flange of the side sill inner having the second welded portion. The reinforcing plate has a U-shaped cross-sectional shape when viewed from the front-rear direction of the vehicle, and is aligned with the front support cross member via the bulkhead fixed inside the U-shaped cross-sectional shape. The side sill structure of the automobile according to claim 3. The coupling portion, wherein the the upper part vehicle longitudinal direction bent pieces bent in either of the bulkhead interference portion, to claim 2, characterized in that formed by bonding superposed on the upper wall of the side sill stiffener Car side sill structure. The bulkhead has at least an upper wall, a side wall, a lower wall, an upper inclined portion provided between the upper wall and the side wall, and a lower inclined portion provided between the side wall and the lower wall. The upper inclined portion side of the upper wall, the side wall surface, and the lower inclined portion side of the lower wall have a joint portion with the side silstifuna.
The upper wall and side wall of the side silstifuna and the upper inclined portion form an upper triangular portion having a closed cross section having a triangular cross section, and also form an upper triangular portion.
The side sill structure for an automobile according to claim 2 , wherein a lower triangular portion having a closed cross section having a triangular cross section is formed by the side wall and the lower wall of the side sill stiffener and the lower inclined portion. The joint portion is bent by bending the side portion of the upper wall of the bulkhead on the upper inclined portion side, the side portion of the side wall, and the side portion of the lower wall on the lower inclined portion side in any of the front-rear directions of the vehicle. The side sill structure for an automobile according to claim 6 , wherein the piece is formed by being overlapped and connected to the upper wall, the side wall, and the lower wall of the side sill stiffener. It is erected between the left and right side sills and is further equipped with a rear support cross member that supports the rear part of the front seat.
The bulkhead has a cross-sectional holding portion that holds the cross-sectional shape of the side silstiffener, and a load transmitting portion that extends inward in the vehicle width direction from the cross-sectional holding portion.
The side sill structure of an automobile according to claim 2 , wherein the load transmitting portion is arranged at a position corresponding to the rear support cross member. The bulkheads are arranged in pairs in the front-rear direction of the vehicle, the pair of bulkheads are connected by a connecting piece, and one end on the side wall side of the side silstifuna in the cross-section holding portion and the other end on the load transmission portion side. The side sill structure of an automobile according to claim 8 , wherein a step portion having a step in the front-rear direction of the vehicle is provided between the two.

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